London Subway Terror Attack: At Least 22 Injured From Blast At Parsons Green Station

No injuries are serious or life-threatening, according to The London Ambulance service.

Alive investigation is taking place following a Friday morning subway explosion in London that’s being treated as a terror attack.

According to Mark Rowley, Assistant Commissioner for London’s Metropolitan Police Service, the blast occurred at Parsons Green Tube Station shortly after 8 a.m. local time. ABC News reports at least 22 have been sent to the hospital, though no injuries are serious or life-threatening, according to The London Ambulance service.

Eyewitness Martin Adams tells ABC News he was riding in the subway at the time of the attack.

“I heard a loud bang and as I looked to my right, there was a flame, a fireball came through the carriage,” he recounts. “As the doors opened, people then began leaving the train straight away. I saw some flames coming from what I thought was a blue bag.”

The Met’s Counter Terrorism Command are investigating after the incident at #ParsonsGreen tube station is declared a terrorist incident

Sally Faulding says she saw people with burns as she watched panic ensue on the subway platform.

“I also saw people injured obviously from having been stampeded on the platform because we were all running,” she said. “People were falling over.”

Police say the cause of the blast was an “improvised device” that failed to fully explode. So far, no arrests have been made.

London Mayor Sadiq Khan said in a statement: “Our city utterly condemns the hideous individuals who attempt to use terror to harm us and destroy our way of life. As London has proven again and again, we will never be intimidated or defeated by terrorism.”